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# Copyright 2017 MongoDB Inc.
#
# Licensed under the Apache License, Version 2.0 (the "License");
# you may not use this file except in compliance with the License.
# You may obtain a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS,
# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
# See the License for the specific language governing permissions and
# limitations under the License.
import SCons
_splitDwarfFlag = '-gsplit-dwarf'
# Cribbed from Tool/cc.py and Tool/c++.py. It would be better if
# we could obtain this from SCons.
_CSuffixes = ['.c']
if not SCons.Util.case_sensitive_suffixes('.c', '.C'):
_CSuffixes.append('.C')
_CXXSuffixes = ['.cpp', '.cc', '.cxx', '.c++', '.C++']
if SCons.Util.case_sensitive_suffixes('.c', '.C'):
_CXXSuffixes.append('.C')
def _dwo_emitter(target, source, env):
new_targets = []
for t in target:
base, ext = SCons.Util.splitext(str(t))
if not any(ext == env[osuffix] for osuffix in ['OBJSUFFIX', 'SHOBJSUFFIX']):
continue
# TODO: Move 'dwo' into DWOSUFFIX so it can be customized? For
# now, GCC doesn't let you control the output filename, so it
# doesn't matter.
dwotarget = (t.builder.target_factory or env.File)(base + ".dwo")
new_targets.append(dwotarget)
targets = target + new_targets
return (targets, source)
def generate(env):
suffixes = []
if _splitDwarfFlag in env['CCFLAGS']:
suffixes = _CSuffixes + _CXXSuffixes
else:
if _splitDwarfFlag in env['CFLAGS']:
suffixes.extend(_CSuffixes)
if _splitDwarfFlag in env['CXXFLAGS']:
suffixes.extend(_CXXSuffixes)
for object_builder in SCons.Tool.createObjBuilders(env):
emitterdict = object_builder.builder.emitter
for suffix in emitterdict.iterkeys():
if not suffix in suffixes:
continue
base = emitterdict[suffix]
emitterdict[suffix] = SCons.Builder.ListEmitter([
base,
_dwo_emitter,
])
def exists(env):
return any(_splitDwarfFlag in env[f] for f in ['CCFLAGS', 'CFLAGS', 'CXXFLAGS'])
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